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RFC 1850 - 3.2. OSPF Area Table

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### 3.2. OSPF Area Table

    --      The OSPF Area Data Structure contains information
    --      regarding the various areas. The interfaces and
    --      virtual links are configured as part of these areas.
    --      Area 0.0.0.0, by definition, is the Backbone Area

        ospfAreaTable OBJECT-TYPE
            SYNTAX   SEQUENCE OF OspfAreaEntry
            MAX-ACCESS   not-accessible
            STATUS   current
            DESCRIPTION
               "Information describing the configured  parame-
               ters  and cumulative statistics of the router's
               attached areas."
           REFERENCE
              "OSPF Version 2, Section 6  The Area Data Struc-
              ture"
          ::= { ospf 2 }

        ospfAreaEntry OBJECT-TYPE
            SYNTAX   OspfAreaEntry
            MAX-ACCESS   not-accessible
            STATUS   current
            DESCRIPTION
               "Information describing the configured  parame-
               ters  and  cumulative  statistics of one of the
               router's attached areas."
           INDEX { ospfAreaId }
           ::= { ospfAreaTable 1 }

    OspfAreaEntry ::=
        SEQUENCE {
            ospfAreaId
                AreaID,
            ospfAuthType
                Integer32,
            ospfImportAsExtern
                INTEGER,
            ospfSpfRuns
                Counter32,
            ospfAreaBdrRtrCount
                Gauge32,
            ospfAsBdrRtrCount
                Gauge32,
            ospfAreaLsaCount
                Gauge32,
            ospfAreaLsaCksumSum
                Integer32,
            ospfAreaSummary
                INTEGER,
            ospfAreaStatus
                RowStatus
                  }

        ospfAreaId OBJECT-TYPE
            SYNTAX   AreaID
            MAX-ACCESS   read-only
            STATUS   current
            DESCRIPTION
               "A 32-bit integer uniquely identifying an area.
               Area ID 0.0.0.0 is used for the OSPF backbone."
           REFERENCE
              "OSPF Version 2, Appendix C.2 Area parameters"
          ::= { ospfAreaEntry 1 }

        ospfAuthType OBJECT-TYPE
            SYNTAX   Integer32
                        -- none (0),
                        -- simplePassword (1)
                        -- md5 (2)
                        -- reserved for specification by IANA (> 2)
            MAX-ACCESS   read-create
            STATUS   obsolete
            DESCRIPTION
               "The authentication type specified for an area.
               Additional authentication types may be assigned
               locally on a per Area basis."
           REFERENCE
              "OSPF Version 2, Appendix E Authentication"
          DEFVAL { 0 }        -- no authentication, by default
          ::= { ospfAreaEntry 2 }

        ospfImportAsExtern OBJECT-TYPE
            SYNTAX   INTEGER    {
                        importExternal (1),
                        importNoExternal (2),
                        importNssa (3)
                      }
            MAX-ACCESS   read-create
            STATUS   current
            DESCRIPTION
               "The area's support for importing  AS  external
               link- state advertisements."
           REFERENCE
              "OSPF Version 2, Appendix C.2 Area parameters"
          DEFVAL { importExternal }
          ::= { ospfAreaEntry 3 }

        ospfSpfRuns OBJECT-TYPE
            SYNTAX   Counter32
            MAX-ACCESS   read-only
            STATUS   current
            DESCRIPTION
               "The number of times that the intra-area  route
               table  has  been  calculated  using this area's
               link-state database.  This  is  typically  done
               using Dijkstra's algorithm."
           ::= { ospfAreaEntry 4 }

        ospfAreaBdrRtrCount OBJECT-TYPE
            SYNTAX   Gauge32
            MAX-ACCESS   read-only
            STATUS   current
            DESCRIPTION
               "The total number of area border routers reach-
               able within this area.  This is initially zero,
               and is calculated in each SPF Pass."
           ::= { ospfAreaEntry 5 }

        ospfAsBdrRtrCount OBJECT-TYPE
            SYNTAX   Gauge32
            MAX-ACCESS   read-only
            STATUS   current
            DESCRIPTION
               "The total number of Autonomous  System  border
               routers  reachable  within  this area.  This is
               initially zero, and is calculated in  each  SPF
               Pass."
           ::= { ospfAreaEntry 6 }

        ospfAreaLsaCount OBJECT-TYPE
            SYNTAX   Gauge32
            MAX-ACCESS   read-only
            STATUS   current
            DESCRIPTION
               "The total number of link-state  advertisements
               in  this  area's link-state database, excluding
               AS External LSA's."
           ::= { ospfAreaEntry 7 }

        ospfAreaLsaCksumSum OBJECT-TYPE
            SYNTAX   Integer32
            MAX-ACCESS   read-only
            STATUS   current
            DESCRIPTION
               "The 32-bit unsigned sum of the link-state  ad-
               vertisements'  LS  checksums  contained in this
               area's link-state database.  This sum  excludes
               external (LS type 5) link-state advertisements.
               The sum can be used to determine if  there  has
               been  a  change  in a router's link state data-
               base, and to compare the link-state database of
               two routers."
           DEFVAL   { 0 }
           ::= { ospfAreaEntry 8 }

        ospfAreaSummary OBJECT-TYPE
            SYNTAX   INTEGER    {
                        noAreaSummary (1),
                        sendAreaSummary (2)
                      }
            MAX-ACCESS   read-create
            STATUS   current
            DESCRIPTION
               "The variable ospfAreaSummary controls the  im-
               port  of  summary LSAs into stub areas.  It has
               no effect on other areas.

               If it is noAreaSummary, the router will neither
               originate  nor  propagate summary LSAs into the
               stub area.  It will rely entirely  on  its  de-
               fault route.

               If it is sendAreaSummary, the router will  both
               summarize and propagate summary LSAs."
           DEFVAL   { noAreaSummary }
           ::= { ospfAreaEntry 9 }

        ospfAreaStatus OBJECT-TYPE
            SYNTAX   RowStatus
            MAX-ACCESS   read-create
            STATUS   current
            DESCRIPTION
               "This variable displays the status of  the  en-
               try.  Setting it to 'invalid' has the effect of
               rendering it inoperative.  The internal  effect
               (row removal) is implementation dependent."
           ::= { ospfAreaEntry 10 }

Next: 3.3. OSPF Area Default Metrics

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RFC 1850 - 3.2. OSPF Area Table